Thanks to all for your posts, in fact the plan is expressed in decimal measure, but 570 , as an example, are centimeters, therefore 5.7 meters .
I read that there are different opinions, and in fact if one room had been decidedly better than the other I would have fewer doubts about it
The room on the ground floor is very long, more than 8 meters, and would allow you to listen with plenty of air behind the speakers and behind the listening point, to stay in the field closer or further away, the big limitation for a Ulysses + system bow is determined by the width of the room, less than 4 meters !!
The room on the first floor is almost square, but it certainly allows for better management of system positioning, perhaps there is little space left behind the loudspeakers and listening point, and therefore some compromises of distance and listening triangle.
The best thing would be to be able to listen in the 2 environments, we'll see what will be possible to implement to evaluate the 2 environments
thanks and any hint or advice will be well evaluated, so many eyes and cd experiences are better than two
greetings, Dario